A farmer uses a drone to spray pesticides on a farm in Bozhou, central China’s Anhui province.

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Multiple employees at a Chinese drone company have landed in hot water after flying an unmanned aircraft over a Beijing suburb, sparking an air force hunt for the unidentified aerial intruder, according to local media.

Three employees at Beijing UAV Sci-Tech Co.—identified only by their surnames Hao, Qiao and Li—have been charged at the Pinggu district court, while a fourth employee, surnamed Wang, has been involved in a separate investigation, the Beijing Morning Post said in a Wednesday report.